.multi-level-container {
  .level-0 {
    margin          : 1em;
    padding         : 1em;
    background-color: rgba($color: #000000, $alpha: .2);
  }

  .level-1 {
    margin-left: 2em;
  }

  .level-2 {
    margin-left: 3em;
  }

  .level-3 {
    margin-left: 4em;
  }

  .level-row {
    display        : flex;
    justify-content: space-between;
  }
}